These items are great for reducing almost all of my TT's back and forth vibration. Using a pair works best. I've only experimented with one. This worked fine, but using two is the best way. Keep in mind that they are not designed to replace traditional wheel chocks. Speaking of which, using it in combination with strong rubber pads that you can tap on with a small rubber mallet to firmly press the tires in works great. Buy them if you're still undecided. They work very well.